package LockAPPC;

public abstract class LockComponent
{
	boolean lock;
	
	// classes to be defined by the extending inner class
	public abstract Object get_host();
	public abstract void expected_pushOp(Object passed);
	public abstract Object expected_popOp();

	// real component methods
	public void pushOp(Object passed)
	{
		if (!lock)
		{
			System.out.println("Locking");
			actual_pushOp(passed);
			System.out.println("Unlocking");
		}
	}
	public Object popOp()
	{
		if (!lock)
		{
			System.out.println("Locking");
			Object pop = actual_popOp();
			System.out.println("Unlocking");
			return pop;
		}
		return null;
	}
	
	public abstract void actual_pushOp(Object passed);
	public abstract Object actual_popOp();
	
}